Perhaps you should try some spelling variations:
"Foundations of poder economicos series" » "Foundations of poder economicos spines", "Foundations of poder economica serie", "Foundations of poder economicos sociales", "Foundations of poder economico series", "Foundations of poder economia series", "Foundations of power economic series"
"Foundations of modern economic theories" » "Foundations of modern economic theory", "Foundations of modelo economico theories", "Foundations of poder economico theories", "Foundations of poder economia theories"

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